package com.feifan.oa.service;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/webSocket/{sid}")
@Component
public class WebSocketServer {
    static Log log = LogFactory.getLog((WebSocketServer.class));
    //静态变量,用来记录当前在线连接数,应该把它设计成线程安全的
    private static int onlineCount = 0;
    //concurrent包的线程安全Set, 用来存放每个客户端对应的WebSocket对象
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
    //与某个客户端连接的会话,需要通过他来给客户端发送数据
    private Session session;
    //接受sid
    private String sid = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("sid") String sid){
        this.session = session;
        webSocketSet.add(this);
        addOnlineCount();
        log.info("有窗口开始监听:" + sid + ",当前在线人数为" + getOnlineCount());
        this.sid = sid;
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("webSocket IO连接异常");
        }
    }

    /**
     * 关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        subOnlineCount();
        log.info("有一连接关闭!当前连接人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("服务端收到的消息" + sid + "的信息" + message);
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                log.error("webSocket IO连接异常");
            }
        }
    }

    /**
     * 发生错误
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务端主动推送消息
     */
    public void sendMessage(String message) throws IOException{
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 全发自定义消息
     */
    public static void sendInfo(String message, @PathParam("sid") String sid) throws IOException{
        log.info("服务端推送消息" + sid + ";推送内容:" + message);
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定推送给这个sid,为null则全部推送
                if (sid == null) {
                    item.sendMessage(message);
                } else if (item.sid.equals(sid)) {
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }





}
